Electromagnetic driving apparatus



Jan. 26 1926.

W. H. GERNS ELECTROMAGNETIC DRIVING APPARATUS Filed A ril 29,

1925 2 Sheets-Shoot 1 WILL/A M. H. GEE/vs INVEN TOR.

ATTORNEY Jam 26 1926 1,571,050

W. H. GERN$ ELECTROMAGNETIC manna Arm'm'rus Filgd April 29, 19, 25 2 Sheets-Sheet 2 WILLIAM. H. GER/-15. INVENTOR- g M ATTORNEY Patented Jan. 2d,, 332%.

srarns I innate earner orrrca;

WILLIAM H. GERNS, OF EAST ORANGE, NEW JERSEY, ASSIGNOR, BY MESNE AQSIGN BIZE'ATTS, TO .BBANDES LABORATORIES,

PQKATION 01 NEW JERSEY.

INCL, OF NEWARK, NEW JERSEY, A (70B- ELECTROMAGNETIC DRIVING APPARATUS.

Application fi1e 1 April 29, 1925. Serial No. 26,707.

To all whom it may concern.

Be it known that 1, WILLIAM H. Genus, a citizen of the United States, residing at East Orange, in the county of Essex and State of New Jersey, have invented certain new and useful-Improvements in Electromagnetic Driving Apparatus, of which the velop a mechanical movement of relatively .large amplitude for driving various types of sound reproducing devices.

Still another object or" my invention is to provide a construction of driving force for transforming electrical vibrations into sound vibrations which consists of two separate magnetic systems actuating a common armature suspended between the magnetic systems and formed and mounted in such mannerwith respect to the magnetic systems that mechanical movements of large amplitude may be developed.

which utilizes'a pair of standard watch case telephone receiver units located on opposite sides of a common armature having a portion thereof serving to space the telephone receiver units one from another and position the oppositely directed pole faces in such manner that electromagnetic push pull forces are imparted to said armature in such manner that the resulting vibrations may be usefully employed for the reproduction of sound.

My invention may be employed as a driving force in a variety of difierent ways as,

for example, an attachment for phono v graph wherein the driving force aotuates the stylus of the usual phonograph reproducer for reproducing sound vibrations through the usual amplifying horn which is connected with the reproducer. The drivto lug force may also be used to vibrate a conical or other shaped sound reproducing diaphragm.

My invention will be more clearly understood by 'referenceto the following specifi- 65 cation and the accompanying drawings forming a part thereof, in which:

Figure l'is a cross-sectional view taken through the driving unit and showing the;

arrangement of the push pull electromag- 79 netic structure; Fig. 2 is a side view of the driving force illustrated in Fig. l;-Fig. 3 is a fragmentary view of the extended end of the armature used in the driving force shown in Fig. 1; Fig. i is a plan view illus" trating one of the electromagnetic driving units and the relation of the armature with respect thereto; Figs. 5, 6 and 7 Show modified forms of the armature construction;

Fig. 8 is a perspective view illustrating the 80 application of my invention as a loud speaker attachment for phonographs; and Fig. 9 is a diagrammatic view partially in crosssection showing the application of the driving force described herein to a conical diaphragm sound reproducer.

Referring to the drawings in detail, reference character 1 designates a base having an integral annular rim 1 forming a support for the watch case telephone receiver units 2 and 3 containing electromagnetic oper ating devices therein which are directed towards each other. The watch case telephone receiver 2 is spaced from the watch case telephone receiver3 by means of the spacing e5 member 4. forming an integral part of an armature member 5. The armature member extends centrally with n the device while the spacing member 1s formed by a pcripheral rim which contacts with the pepermanent ma netic system 9 is secured within the to ephone receiver casing by means of screws 9. The telephone receiver casing 3 includes therein the pole pieces Y spaced to enable an up'w'ardly eittended end r of the armature portion 5 to project to utilize the phonograph as a rcproducer entertainment.

therebetween. The armature portion 5 has a substantially rectangular portion 17 centrally within the driving unit; positioned directly over the pole, tips. The armature is fulcrutned at and in order to enable the device to be used forthe driving of a phonograph sound reprodueer a slot; 16 is cut in the extended end 15 to receivethe pick or stylus 30 of the phonograph soundreprm duccr 28 as illustrated more clearly in Fig.

8. A gap is provided between the adjacent peripheral edges of "thetelephone receiver.

casings 2 and. 3 and inthe housing 1 as represented at 21 to cnabledhe phonograph stylus to be inserted therein; v

As represented more clearly in Fig. 8 the driving force when used as a loud speaker attachment for phonographs is mounted adjacent; the. phonograph sound box. .28 Which'is carried'upon movable tone arm 27. The extended end 15 ot'the armafl tare vibratesin such manner thatstylus 30 1S rocked about, its p vot 31 imparting vibrations to the die liragm of. the sound reproduecr 28 whereiliysound maybe delivered through the usual phonograph sound amplifying horn. \Vhen employed in this manher the device may be connected in the output circuit of a radio receiving apparatus of radio coneerts lcctures, news. and other I Connecting wires 11 lead from the driving unit to the output. circuit of the radio receiving apparatus.

In orderto adapt. the driving force to either a loud speaker attachment for phonographs or as a driver for conical or other shaped die hragms, I provide various shapes for tie armature: .For example, in Fig. 5 the armature has a "Jortion :i fulcrumcd at 34 with an exten ed ortion 15 and an end 16 to receive the pick of the. phonograph while thetelephone reccivcr casings 2 and" 3 are s need about their pe ripheries by means 0 members 19 and 10 with the extended peripheral portions 4. When the driv'ing force is used in connection with conical diaphragrns the peripheral pornone of the armature is completely irlbsed as represented in Figs. 6 and 7, and serves to space casings 2 and 3 one from another as more clearly shown in Fig. 9; The mechanical movement developed by as represented at 18 in Fig. 7 and derive mechanical motion from the extremity thereof. v In the operation of the unit. the bobbins 6, (32, 5, T and 8" are connected in series in such manner that the poles normally attract tin: armature portion 17 with a permanent flux in mid iosition. That is to say, the pole piece 5 won d be normally south while the pole piece 7 is normally north, and the pole piece 6 would be normally north while the pole piece 8 is normally south. \Vhen c'urrent flows in the coils it alternately strengthens one pair ol magnets and weakens the other pair causing vibration of the armature and a p ltsli pull etlect thereon. lly reason of the opposed relation of the magnets a considerable amplitude of vibration may be derelo and. It will be observed that very small reluctance aps 35 and 36 are provided between the o as to path of low permeability or the 8 It, will be observed that the construction of driving force whi h I have described is capable of inexpensivemanufacture on a quantity production basis from practically standard parts iii iffz' leplione -I8LC1VEI units. I have found tlitiiidriviiig ,torce described herein to be particularlyeliective in opera tion. While I hav jfitlcsrribcd the invention in certain particular wmbodiments and referred to certa n applications thereof, I desire that it be understood that modifications ans may be made and that'no limitations upon ters Patent of the United States is as" follows:

L'Ari electromagnetic driving apparatus colnprising'in combination a pair of telephone receiver unitseach including :1 casing, permanent magnetic means and elcctromaenelic'means, a substantially flatperiphoral face on the edge portions of each .of said telephone receiver casings, and an armature. member consisting of an inwardly extending tongue positioned centrally between said electromagnetic means. and a ring shaped portion formed integral with said in wardly extending ton ne haviirc flat faces arranged to abut Wlil t e'flat peripheral fact of said casin whereby said electromagnphc. means may properly spaced from said inwardly large (intending tongue for developing mechanical .ber arranged to be actuated by each of said devices, said armature member being interposed betwecn sald sets of elect-romagnetlc driving devices fiIlflOOIIlPI'ISlIlg a magnetic ring shaped member, a tongue protruding inward] from one side thereof, and an en- .arm'ature portion formed on said tongue, said tongue being arranged to fill-- crum about the junction ortion of'said tongue with said ring shape member whereby mechanical forces may be developed in said armature member from electrical vibrations introduced in said electromagnetic driving. devices. I a

3; An armature member for electromagnetic apparatus comprising in combination a substantiallyring shaped portion, a tongue extending inwardly from said ring shaped portion and an enlarged central 'portion formed on said tongue, said tongue being arranged to fulcrum about the junction of said tongue and said ring shaped portion whereby mechanical movement of saidannature may be secured for developing-sound vibrations therefrom. 5 In testimony whereof I aflix my signature.

WILL'IAMIH. GERNS. 

